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See below reference chart for specs:
| SILMAR9A9S: | 14mm Hex | 26.50mm Reach | 0.9mm Gap | 0.6mm Iridium Electrode | Solid Nut | Resistor: Yes |
| SILMAR9B-9: | 14mm Hex | 26.50mm Reach | 0.9mm Gap | 0.6mm Iridium Electrode | Threaded Stud | Resistor: Yes |
| SIMR8A-9: | 16mm Hex | 19.00mm Reach | 0.9mm Gap | 0.6mm Iridium Electrode | Threaded Stud | Resistor: Yes |
